How to solve the vibration of woodworking circular saw blade?
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How to solve the vibration of woodworking circular saw blade?
- Why does the circular saw blade vibrate?
The vibration of the circular saw blade refers to the reciprocating lateral movement of the saw blade near its equilibrium position. The vibration of the saw blade is caused by external interference and is always expressed as a certain “level”. The vibration will increase saw path loss, reduce sawing accuracy, increase the noise level, and shorten the service life of saw blades. Therefore, in addition to special cutting requirements, the vibration of the tool should be minimized in wood cutting.
The vibration of most saw blades can be regarded as a combination of some simple vibration modes. Each simple vibration mode has a specific vibration shape and vibrates at a certain frequency. Each vibration mode contains an integer number of node circles Dx and number of node diameters n.
The vibrating mode of circular saw bladeThe vibration frequency of each mode is called the natural frequency of the mode. The natural frequency of a system is only related to the characteristics of the system itself, not its amplitude. It depends on the properties of the saw blade material (such as elastic modulus, mass, density and Poisson’s ratio, etc.), the geometric size of the saw blade, the clamping ratio (chuck diameter/saw blade diameter) and the stress state of the saw blade.
The stress state of the saw blade is determined by the tensile stress, rotational stress, thermal stress and residual stress remaining in the manufacturing process. Therefore, changing any of the above parameters will change the natural frequency of the saw blade. In theory, all combinations of node circle and node diameter are possible. However, in most circular saw blades used in woodcutting, the transverse vibration mode of the saw blade is composed of 0-6 pitch diameter and 0 pitch circle.
- Can the vibration of the circular saw blade be eliminated?
During the cutting process, the saw blade will inevitably be disturbed by external forces and vibrate. This disturbing external force is called the exciting force. The force of the workpiece on the saw blade, the imbalance of the saw blade and the saw shaft, or the external force caused by the vibration of the drive motor will become the exciting force. The saw blade always responds to these exciting forces in a manner determined by these external forces and vibration modes.
All saw blades vibrate during work, but they do not necessarily resonate or lose stability. When approaching the condition of lateral instability, any small disturbance will cause the saw blade to leave the equilibrium position with a large reciprocating lateral displacement. The theory of saw blade stability is actually the mathematical and mechanical relationship between the structural parameters, environmental variables and lateral instability conditions of the saw blade. It has been confirmed that there are at least two instability mechanisms for circular saw blades: one is static buckling instability and the other is critical speed instability.
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