Diamond circular saw blades have very obvious characteristics of thin plate structure, and are prone to deformation during sawing，which affects the dynamic stability during processing. To analyse the dynamic stability of diamond circular saw blades, it mainly starts from the stress state, natural frequency and critical load of circular saw blades during processing . There are many process parameters that affect the above indicators, such as saw blade rotation speed, clamping flange diameter, saw blade thickness, saw blade diameter and sawing depth, etc.. Now a series of commonly used cost-effective diamond circular saw blades are selected from the market. By changing the key process parameters, the finite element analysis method and the extreme difference analysis method are used to obtain the impact of the key process parameters on the stress state, natural frequency and critical load of the circular saw blade, and explore and optimise the key process parameters to improve the dynamic stability of the saw blade. The theoretical basis of sex.

1.1Effect of clamping disc diameter on saw blade stress.

When the rotation speed of the circular saw blade is selected as 230 rad/s, the diameter of the clamping plate

 is 70 mm, 100 mm and 140 mm respectively. After finite element analysis, the unit node stress of the saw blade

 is obtained under different clamping disc diameter constraints, as shown in Figure 5b. As the diameter of the

 clamping plate increases, the stress of the unit node of the saw blade increases; however, when the constraint

 range of the clamping plate covers the four noise reduction holes on the saw blade [10-12], the stress value

 decreases with the increase of the diameter of the clamping plate.

1.2 Effect of saw blade thickness on saw blade stress

When the circular saw blade rotation speed is selected at 230 rad/s and a clamping disk with a diameter of

100 mm is selected to exert a complete constraint on the saw blade, the thickness of the saw blade is changed

and the stress state of the unit nodes with a thickness of 2.4 mm, 3.2 mm and 4.4 mm of the saw blade is 

analysed by finite element. The change trend of meta-node stress is shown in Figure 5c. With the increase of

the thickness of the saw blade, the stress of the joint of the saw blade unit is significantly reduced.

1.3 Effect of saw blade diameter on saw blade stress

The saw blade rotation speed is selected as 230 rad/s, and a flange plate with a diameter of 100 mm is

 selected to exert a complete constraint on the saw blade. When the thickness of the saw blade is 3.2 mm,

 the diameter of the saw blade is changed to the stress state of the unit nodes with saw blade diameters of

 318 mm, 368 mm and 418 mm respectively. For finite element analysis, the change trend of unit node stress is 

shown in Figure 5d. In the sawing mode of constant line speed, with the increase of the diameter of the saw 

blade, the stress of the joint of the saw blade unit increases significantly.

The extremely poor analysis of the impact of the above process parameters on the stress of the saw blade is 

shown in Table 3. It can be seen that the rate of change of the process parameters and the stress extreme

 difference corresponding to Table 3 shows that the speed of the saw blade has the greatest impact on the 

stress of the joint of the saw blade unit, the diameter of the saw blade and the thickness of the saw blade, 

followed by the least impact on the diameter of the clamping plate. The relationship between saw blade

 processing stability and stress is: the smaller the stress value of the saw blade, the better the processing 

stability of the saw blade. From the perspective of reducing the stress of unit nodes and improving the

 processing stability of the saw blade, reducing the rotation speed of the saw blade, increasing the thickness

 of the saw blade, or reducing the diameter of the saw blade in the state of constant line speed cutting can

 improve the dynamic stability of the saw blade; the diameter of the clamping plate is bounded by whether to

 cover the noise reduction hole, and the processing stability of the saw blade outside the noise reduction hole

 is with the clamping plate. The diameter increases and rises, and the opposite is true in the noise reduction

 hole.