Influence of Radial Slots on the Vibration Characteristics of Circular Saw Blade

2012 ◽  
Vol 226-228 ◽  
pp. 232-236
Author(s):  
Yuan Li
Keyword(s):  
Finite Element Method ◽  
Dynamic Characteristics ◽  
Natural Frequencies ◽  
Matrix Perturbation ◽  
The Finite Element Method ◽  
Cutting Stability ◽  
Circular Saw ◽  
D’Alembert Principle ◽  
Circular Saw Blade ◽  
Saw Blade

In order to improve thin circular saw blade’s cutting stability, it’s nonlinear dynamic incremental equilibrium equation was obtained according to nonlinear vibration theory and D’Alembert principle. It could be concluded from the above equation that cutting several radial slots on the circumference of the saw blade will cause significant change of dynamic characteristics of the saw blade. This thesis, employing the finite element method and matrix perturbation principle, calculated and studied respectively the effect of number, length and width of the radial slots on natural frequencies of the saw blade. Results show that number and length have distinct influence on natural frequencies but hardly does width have. So proper choice of number, length and width of the radial slots can improve effectively the dynamic characteristics of the saw blade.

The Influence of Tangential Roller Pressure on the Stability of Circular Saw Blade

2014 ◽  
Vol 614 ◽  
pp. 32-35 ◽  
Author(s):  
Ming Song Zhang ◽  
Yi Zhang ◽  
Jian Jun Ke ◽  
Xiao Wei Li ◽  
Lian Bing Cheng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Symmetric Model ◽  
The Finite Element Method ◽  
Circular Saw ◽  
The Face ◽  
Circular Saw Blade ◽  
Cyclic Symmetric ◽  
The Stability ◽  
Saw Blade

The finite element method was used to study tangential roller method impact on the stability of circular saw blade. Using 30 ° cyclic symmetric model is analyzed. The results show that the tension of the saw blade is not the same, and tensioning effect is different, when the tangential roller pressure is not same. At the same time, after tangential roller, the face run out of saw blade is small, which show that the smoothness of tangential roller is better.

The Analysis of Dynamic Characteristics in Reduction of the Circular Saw Idling Noise

2011 ◽  
Vol 228-229 ◽  
pp. 477-483
Author(s):  
Xiao Ling Wang ◽  
Zhong Jun Yin ◽  
Chao Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
The Finite Element Method ◽  
Uniform Thickness ◽  
The Core ◽  
Circular Saw ◽  
Damping Material ◽  
Circular Saw Blade ◽  
Damping Materials ◽  
Saw Blade

We investigate the natural frequency and the amplitude of circular saw blades during idling. We use four blades in the paper: 1) The traditional circular saw blades, 2) The circular saw blade with damping materials which is distributed in the core of blade, and the circular saw blade has a uniform thickness, 3) Similar to the above one but the circular saw blade has a non-uniform thickness, the damping region is thicker than other region of the circular blade, 4) the circular saw blade with damping material which is distributed around the core of blade by four small circular regions. We adopt the Finite Element Method in our numerical analysis. Our analytical results are very useful for a better design of circular saw blades.

scholarly journals COMPARISON OF SAW BLADE NATURAL FREQUENCIES AND CRITICAL SPEEDS USING CSAW AND FINITE ELEMENT ANALYSIS

2011 ◽  
Author(s):  
J. Poirier ◽  
P. Radziszewski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Saw Blade ◽  
Circular Saws ◽  
The Finite Element Model ◽  
Element Method

The natural frequencies of circular saws limit the operating speeds of the saws. Current industry methods of increasing natural frequency include pretensioning, where plastic deformation is induced into the saw. To better model the saw, the finite element model is compared to current software for steel saws; C-SAW, a software program that calculates frequencies for stiffened circular saws. Using C-SAW and the finite element method the results are compared and the finite element method is validated for steel saws.

scholarly journals Comparison of Natural Frequencies Values of Circular Saw Blade Determined by Different Methods

2015 ◽  
Vol 66 (2) ◽  
pp. 123-128
Author(s):  
Ján Svoreň ◽  
Ľubomír Javorek ◽  
Adam Droba ◽  
Dušan Paulíny
Keyword(s):  
Natural Frequencies ◽  
Circular Saw ◽  
Circular Saw Blade ◽  
Saw Blade

scholarly journals The Shapes of Teeth of Circular Saw Blade and Their Influence on its Critical Rotational Speed

2015 ◽  
Vol 63 (2) ◽  
pp. 399-403 ◽  
Author(s):  
Adam Droba ◽  
Ján Svoreň ◽  
Ján Marienčík
Keyword(s):  
Adverse Effects ◽  
Rotational Speed ◽  
Natural Frequencies ◽  
Computer Software ◽  
Variable Parameter ◽  
Circular Saw ◽  
Critical Rotational Speed ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
High Level

The main problems during cutting with circular saw blade are inaccurate cut, low quality of surface, high level of noise. These adverse effects are related to oscillation of circular saw blade. This oscillation cause adverse effects not only on workpiece but also on tool. In some case the circular saw blade reaches the value of critical rotational speed which leads to its instability and cause the oscillation of blade which may leads to destruction of tool. So the reduction of the amplitude of oscillation is essential for removing the adverse effects. This paper deals about influence of shapes of teeth as a type of modification that has positive effect oncritical rotational speed of circular saw blade. The parameters of studied models of circular saw blade were 42 number of teeth and the height of teeth with slice from sintered carbide was 14 mm. The variable parameter was the ratio between surface of teeth and surface of teeth gap. In this study was used computer software Creo Parametric 1.0 for obtaining natural frequencies of studied models. This software uses in analysis finite element method (FEM). There were done some steps to idealize the models. For calculating static and dynamics natural frequencies of modelswere used modal analysis. The critical rotational speed was calculated from obtained results by Creo Parametric 1.0 and compared on 5 models of tool.

scholarly journals Characteristics of self-excited alternate-tooth vibration of circular saw blade

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3840-3850
Author(s):  
Ken Takeyama ◽  
Hideyuki Yokochi ◽  
Satoru Nishio ◽  
Satoru Tsuchikawa
Keyword(s):  
Solid Wood ◽  
Vibration Modes ◽  
The Finite Element Method ◽  
Cutting Resistance ◽  
Circular Saw ◽  
Cutting Surface ◽  
Speed Range ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
Cutting Experiments

In recent years, circular saw blades with thinner kerfs have been in high demand for improvement of the production yield of wood-based materials and the reduction of sawdust. In the case of ripping of solid wood, the number of teeth of a circular saw blade is normally set to 40 or 50, with a diameter of 305 mm, which allows less cutting resistance and smooth exhausting of sawdust. However, at certain rotational speeds, self-excited alternate-tooth vibration can easily occur in circular saw blades with such thin kerfs and so few teeth. Therefore, the cutting surface quality tends to be worse. In this study, the mechanism of this self-excited alternate-tooth vibration was clarified. The vibration mode and frequency were predicted by the finite element method. In addition, a circular saw blade with a body thickness 1.5 mm and 50 teeth was employed for wood-cutting experiments. The rotational speed range of the self-excited alternate-tooth vibration modes and their frequencies were investigated. When a double of the tooth passage frequency was slightly higher than the frequencies of the alternate-tooth vibration modes, an alternate-tooth vibration of the regenerative chatter type was excited, owing to the forces on the sides of the tooth.

scholarly journals Influence of temperature distribution on circular saw blade natural frequencies during cutting

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 1076-1090
Author(s):  
Miran Merhar
Keyword(s):  
Temperature Distribution ◽  
Temperature Difference ◽  
Natural Frequencies ◽  
Point Of View ◽  
Cutting Edge ◽  
Circular Saw ◽  
Rate Of Increase ◽  
Circular Saw Blade ◽  
Saw Blade ◽  
Experimental Findings

When cutting wood, heat is generated in the cutting zone and in the gullet due to the friction between the teeth of the blade and the material that is being cut. Since the wood is hydrophilic, the saw blade cannot be cooled with liquids, as is usual when cutting metals. The only way to remove the heat from the source is by conductivity to the centre of the saw blade and then by convection into the air. This research presents an analytical model to calculate the natural frequencies of circular saw blades exposed to different temperature distributions. The model confirmed experimental findings of many authors, i.e. the heating of the saw blade cutting edge reduces its natural frequencies, the rate of the reduction depending on the temperature difference between the cutting edge and the rest of the blade and on the shape of the temperature distribution. In contrast, heating the centre of the saw blade increases its natural frequencies, the rate of increase depending on the temperature difference and the shape of the temperature distribution. With the presented model, the most favourable temperature distribution can be calculated from the point of view of the critical saw blade speed, which can be achieved by heating or cooling the centre of the saw blade.

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